Methods for controlling the power supply of a vacuum cleaner motor

ABSTRACT

Applicant has created systems, methods, and apparatuses for controlling the power supply of a vacuum cleaner motor. The systems and apparatuses include pressure taps to detect a pressure differential within a vacuum cleaner, a float that adjusts depending on an amount of liquid stored, and a power switch that toggles based on the pressure differential created by the position of the float. Alternatively, the float can be replaced by an air chamber so that the pressure differential is created by liquid rising above the volume of air trapped in the chamber. The method can include interrupting the current supplied to an electrical circuit of a power switch based upon a pressure differential created within the vacuum. By controlling the power supply to a vacuum cleaner motor based on a pressure differential created by the amount of liquid stored within the vacuum cleaner, the vacuum cleaner can automatically disable the vacuum cleaner&#39;s motor as the vacuum approaches its maximum liquid capacity.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation, and claims priority from U.S. patentapplication Ser. No. 14/942,224, filed Nov. 16, 2015, entitled “SYSTEMS,METHODS, AND APPARATUSES FOR CONTROLLING THE POWER SUPPLY OF A VACUUMCLEANER MOTOR,” which is a continuation, and claims priority from U.S.patent application Ser. No. 14/178,579, filed Feb. 12, 2014, entitled“SYSTEMS, METHODS, AND APPARATUSES FOR CONTROLLING THE POWER SUPPLY OF AVACUUM CLEANER MOTOR,” the entire disclosures of which are incorporatedherein by specific reference.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

REFERENCE TO APPENDIX

Not applicable.

BACKGROUND OF THE INVENTION Field of the Invention

The inventions disclosed and taught herein relate generally tocontrolling the power supplied to a vacuum cleaner's motor. Morespecifically, the inventions described relate to interrupting the powersupplied to a vacuum cleaner's motor in response to the vacuum detectingthat is approaching its maximum capacity for storing wastes, such asliquids or the like.

Description of the Related Art

The inventions disclosed and taught herein are directed to an improvedsystem for controlling the power supplied to a vacuum cleaner's motor.Although these inventions can be used in numerous applications, theinventions will be disclosed in only a few of many applications forillustrative purposes.

Vacuum cleaners, such as wet/dry vacuums or work area vacuums, arecommonly used to collect liquids and other aqueous-based debris andmedia from work surfaces and the like. When a wet/dry vacuum cleaner isswitched to its “on” position, the vacuum motor is energized, which, inturn, rotates a blower wheel. The rotation of the blower wheel causes avacuum within the vacuum collection drum. The vacuum created allows avolume of air to flow through an inlet plenum and into the drum of thevacuum.

Typical wet/dry vacuums will include a filter and a filter cageinterfaced between the inlet plenum and the collection drum. As thevacuum collects liquids and other aqueous-based media, the collectiondrum fills from the bottom towards the top of the drum, which, in atypical configuration, contains the vacuum's powerhead and motor. As thedrum fills, an operator must be cautious as to avoid overfilling thevacuum's drum beyond its capacity. That is, without a mechanism toprevent overfilling, an operator could carelessly continue operating thevacuum after the liquid reaches the collection drum's maximum capacity,resulting in significant damage to the vacuum and its motor.

In order to mitigate these risks, previous solutions to this probleminclude disposing a float within the collection drum's filter cage. Thefloat can adjust its position depending on the amount of liquid andother debris stored in the drum of the vacuum. Typically, wet/dryvacuums are coupled to a hose for facilitating the collection of theliquid media drawn from the work surface into the drum. As the drumfills with this liquid media, the float rises and eventually contactsthe inlet plenum. By contacting the plenum, the float disrupts thevacuum created in the drum, thus preventing any more liquid from beingcollected in the drum until the liquid is subsequently disposed.

For example, U.S. Pat. No. 5,032,155 to Wiese et al. discloses a wet/dryvacuum with automatic shutoff that interrupts the flow of air to avacuum blower when water collected in the collection tank reaches apredetermined level. The system employs a float that is shaped to definea downwardly extending recess adapted to surround the filter element sothat when the liquid level in the tank reaches a predetermined level,the float is buoyed upwardly until its annular rim engages the sealgasket to interrupt the flow of air to the blower inlet.

U.S. Pat. No. 5,394,587 to Parise discloses a hot water vacuumextraction machine with float sealed riser tube shut-off device thatincludes a float ball capable of closing off the top of the riser tubeto prevent water returning with the airstream to the vacuum pump and itsdrive motor when overfilling the recovery tank with water. The hot watervacuum extraction machine employs a hydro-air filter with a float sealedriser tube for automatically sealing off the inlet port to the risertube as a result of a predetermined volume of water accumulating withinthe recovery tank. It further prevents water from splashing into theopen inlet port of the riser tube upon overfilling of the recovery tankwith water.

Although these prior art solutions can be effective for preventing thecollection drum from being accidentally overfilled, there are severaldrawbacks to them as well. For example, even after the vacuum in thecollection drum is disrupted, the motor will continue operate until anoperator acts upon it (e.g., manually toggles the power supply switchfrom its “on” position to its “off” position). Furthermore, by requiringan operator's manual intervention to disable the motor, an operator isrequired to consistently monitor the status of the vacuum to ensure thatshe is able to manually shut down the vacuum after it reaches itsfilling capacity.

What is required, therefore, is a solution that provides a vacuumcleaner with a mechanism for controlling the power supply to the vacuumupon detecting that the collection drum is approaching or has reachedits filing capacity without the need for manual intervention.

Accordingly, the inventions disclosed and taught herein are directed tosystems, methods, and apparatuses for controlling the power supply of avacuum cleaner motor that overcome the problems as set forth above.

BRIEF SUMMARY OF THE INVENTION

The inventions disclosed and taught herein are directed to systems,methods, and apparatuses for controlling the power supply of a vacuumcleaner motor. The objects described above and other advantages andfeatures of the invention are incorporated in the application as setforth herein, and the associated appendices and drawings.

Applicant has created systems, methods, and apparatuses for controllingthe power supply of a vacuum cleaner motor. The systems and apparatusesinclude pressure taps to detect a pressure differential within a vacuumcleaner, a float that adjusts depending on an amount of liquid stored,and a power switch that toggles based on the pressure differentialcreated by the position of the float. Alternatively, the float can bereplaced by an air chamber so that the pressure differential is createdby liquid rising above the volume of air trapped in the chamber. Themethod can include interrupting the current supplied to an electricalcircuit of a power switch based upon a pressure differential createdwithin the vacuum. By controlling the power supply to a vacuum cleanermotor based on a pressure differential created by the amount of liquidstored within the vacuum cleaner, the vacuum cleaner can automaticallydisable the vacuum cleaner's motor as the vacuum approaches its maximumliquid capacity.

In accordance with a first embodiment of the present invention, thedisclosure provides an apparatus for interrupting a power supply to avacuum cleaner motor that can include an inlet plenum and at least twopressure taps adapted to detect a pressure differential between a firstand second portion of the inlet plenum. The first and second portion ofthe inlet plenum can include an area inside the inlet plenum and an areaoutside the inlet plenum, respectively. The apparatus can furtherinclude a float adapted to change its position as a function of anamount of liquid stored in a vacuum cleaner and a power switch adaptedto toggle from an “on” position to an “off” position based on thepressure differential between the first and second portion of the inletplenum.

The apparatus can further include a switch actuator and a biasingdevice, wherein the switch actuator can be coupled to the power switchand can be further adapted to toggle the power switch from the “on”position to an “off” position depending upon a state of the biasingdevice, such as when the biasing device is in an unbiased state.Finally, the apparatus can further include a membrane, wherein themembrane can be adapted to flex in response to the pressure differentialbetween the first and second portion of the inlet plenum. The pressuredifferential can be a result of the float contacting at least a portionof the inlet plenum. Further, the float can rise and fall as the amountof liquid stored in the vacuum cleaner increases and decreases,respectively, and the float can rise to contact the at least a portionof the inlet plenum as the amount of liquid stored in the vacuum cleanapproaches its maximum capacity.

In accordance with a further embodiment of the present disclosure, anapparatus for interrupting a power supply to a vacuum cleaner motor thatcan include an inlet plenum and at least two pressure taps adapted todetect a pressure differential between a first and second portion of theinlet plenum is provided. The first and second portion of the inletplenum can include an area inside the inlet plenum and an area outsidethe inlet plenum, respectively. The apparatus can further include afloat adapted to change its position as a function of an amount ofliquid stored in a vacuum cleaner and a power switch comprising anelectrical circuit, wherein the current supply to the electrical circuitcan be adapted to be interrupted based on the pressure differentialbetween the first and second portion of the inlet plenum.

The apparatus can further include a switch shoulder and an actuator,wherein the current supply can be adapted to be interrupted dependingupon the position of the actuator and the current supply can beinterrupted when the switch shoulder contacts the actuator. Finally, theapparatus can further include a membrane, wherein the membrane can beadapted to flex in response to the pressure differential between thefirst and second portion of the inlet plenum. The pressure differentialcan be a result of the float contacting at least a portion of the inletplenum. Further, the float can rise and fall as the amount of liquidstored in the vacuum cleaner increases and decreases, respectively, andthe float can rise to contact the at least a portion of the inlet plenumas the amount of liquid stored in the vacuum cleaner approaches itsmaximum capacity.

In accordance with yet another embodiment of the present invention, thedisclosure provides details of an apparatus for interrupting a powersupply to a vacuum cleaner motor that can include an air chamber,wherein the pressure of air in the air chamber can be adapted to vary asa function of an amount of liquid stored in a vacuum cleaner. Theapparatus can further include at least two pressure taps adapted todetect a pressure differential between a first and second portion of thevacuum cleaner and a power switch that can include an electricalcircuit, wherein a current supply to the electrical circuit can beadapted to be interrupted based on the pressure differential between thefirst and second portion of the vacuum cleaner. The first and secondportion of the vacuum cleaner can include an area inside the air chamberand an area outside the air chamber, respectively, and the pressuredifferential can increase as the amount of liquid stored in the vacuumcleaner rises above the air chamber. Finally, the apparatus can furtherinclude a membrane, wherein the membrane can be adapted to flex inresponse to the pressure differential between the first and secondportion of the inlet plenum.

The disclosure also provides a first embodiment of a system forinterrupting a power supply to a vacuum cleaner that can include avacuum cleaner motor and a drum that can be adapted to store liquidscollected by the vacuum cleaner and further that can include an inletplenum. The system can further include at least two pressure taps thatcan be adapted to detect a pressure differential between a first andsecond portion of the inlet plenum, a float that can be adapted tochange its position as a function of the amount of liquid stored in thedrum, and a power switch adapted to disable the vacuum cleaner motor.The power switch can be adapted to toggle from an “on” position to an“off” position upon the detection of the pressure differential betweenthe first and second portion of the inlet plenum.

The disclosure also provides a second, further embodiment of a systemfor interrupting a power supply to a vacuum cleaner that can include avacuum cleaner motor and a drum that can be adapted to store liquidscollected by the vacuum cleaner and further comprising an inlet plenum.The system can further include at least two pressure taps that can beadapted to detect a pressure differential between a first and secondportion of the inlet plenum, a float that can be adapted to change itsposition as a function of the amount of liquid stored in the drum, and apower switch comprising an electrical circuit adapted to disable thevacuum cleaner motor. The current supply to the electrical circuit canbe adapted to disable the vacuum cleaner motor.

The disclosure also provides yet another embodiment of a system forinterrupting a power supply to a vacuum cleaner that can include avacuum cleaner motor and a drum that can be adapted to store liquidscollected by the vacuum cleaner. The system can further include an airchamber, wherein the pressure of air in the air chamber is adapted tovary as a function of an amount of liquid stored in the vacuum cleanerand at least two pressure taps that can be adapted to detect a pressuredifferential between a first and second portion of the vacuum cleaner.Furthermore, the system can include a power switch comprising anelectrical circuit that can be adapted to disable the vacuum cleanermotor. The current supply to the electrical circuit can be adapted to beinterrupted based on the pressure differential between the first andsecond portion of the vacuum cleaner.

The disclosure also provides a method for interrupting a power supply toa vacuum cleaner motor that can include the steps of providing an inletplenum and providing a float that can be further adapted to change itsposition as a function of an amount of liquid stored in a vacuumcleaner. The method can further include the steps of detecting apressure differential between a first and second portion of the inletplenum based, at least in part, upon the position the float andinterrupting a current supply of an electrical circuit of a power switchcoupled to the vacuum cleaner motor based on the detected pressuredifferential between the first and second portion of the inlet plenum.

The disclosure further provides a method for activating a power supplyto a vacuum cleaner motor that can include the steps of providing areset shaft, wherein at least a portion of the reset shaft is disposedas an external surface of a vacuum cleaner and providing a actuator,wherein the actuator is coupled to a stop shoulder and a power switchthat can include an electrical circuit. Furthermore, the method caninclude the step of decoupling the stop shoulder from the actuator byrepositioning the reset shaft, wherein the decoupling step can beadapted to complete an electrical circuit coupled to the vacuum cleanermotor.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The following figures form part of the present specification and areincluded to further demonstrate certain aspects of the presentinvention. The invention may be better understood by reference to one ormore of these figures in combination with the detailed description ofspecific embodiments presented herein.

FIG. 1A illustrates a schematic side view of a first embodiment of anexemplary vacuum cleaner of the present disclosure with the filterremoved for clarity.

FIG. 1B illustrates a schematic side view of the vacuum cleaner of FIG.1A, with a partial cut-away showing a first embodiment of an exemplary,typical filter cage inside the collection drum of a vacuum cleaner withthe filter removed for clarity.

FIG. 2A illustrates a section view of the vacuum cleaner of FIG. 1A withthe filter removed for clarity.

FIG. 2B illustrates an enlarged view of the vacuum cleaner illustratedin FIG. 2A.

FIG. 3A illustrates an enlarged view of the vacuum cleaner illustratedin FIG. 2B with several elements omitted for clarity in an exemplaryconfiguration where pressure P1 is approximately equal to P2.

FIG. 3B illustrates an enlarged cross-sectional view of the vacuumcleaner illustrated in FIG. 3A with several elements omitted for clarityin an exemplary configuration where pressure P1 is greater than pressureP2.

FIG. 3C illustrates a non-sectioned view of the vacuum cleanerillustrated in FIG. 3B with several elements omitted for clarity.

FIG. 3D illustrates a detail view of FIG. 3A with the spring capreleased and the actuator and switch in the “off” position.

FIG. 4A illustrates a front view of the upper housing illustrated inFIG. 3A with several elements omitted for clarity.

FIG. 4B illustrates a side view of the upper housing illustrated in FIG.4A with several elements omitted for clarity.

FIG. 4C illustrates an isometric view of the upper housing illustratedin FIG. 4A with several elements omitted for clarity.

FIG. 5A illustrates a front-side view of the lower housing illustratedin FIG. 3A.

FIG. 5B illustrates an isometric view of the lower housing illustratedin FIG. 3A.

FIG. 6A illustrates a side view of the spring cap illustrated in FIG.3A.

FIG. 6B illustrates an isometric view of the spring cap illustrated inFIG. 3A.

FIG. 7 illustrates an isometric view of the plunger and flangeillustrated in FIG. 3A.

FIG. 8 illustrates a schematic side view of a second embodiment of anexemplary vacuum cleaner of the present disclosure with the filterremoved for clarity.

FIG. 9A illustrates an enlarged schematic side view of a secondembodiment of an exemplary vacuum cleaner of the present disclosure withseveral elements omitted for clarity.

FIG. 9B illustrates a section view of the vacuum cleaner of FIG. 9A withthe switch and reset shaft not sectioned for clarity and in an exemplaryconfiguration where pressure P1 is approximately equal to pressure P2.

FIG. 9C illustrates a section view of the vacuum cleaner of FIG. 9A withthe switch and reset shaft not sectioned for clarity and in an exemplaryconfiguration where pressure P1 is greater than pressure P2.

FIG. 10A illustrates a side view of the reset shaft illustrated in FIG.9C.

FIG. 10B illustrates a section view of the reset shaft illustrated inFIG. 9C taken along section line A-A of FIG. 10A.

FIG. 10C illustrates an isometric view of the reset shaft illustrated inFIG. 9C.

FIG. 11A illustrates a side view of the upper housing illustrated inFIG. 9C.

FIG. 11B illustrates a left isometric view of the upper housingillustrated in FIG. 9C.

FIG. 11C illustrates a top view of the upper housing illustrated in FIG.9C.

FIG. 11D illustrates a right isometric view of the upper housingillustrated in FIG. 9C.

FIG. 12A illustrates a side view of the lower housing illustrated inFIG. 9C.

FIG. 12B illustrates an isometric view of the lower housing illustratedin FIG. 9C.

FIG. 13 illustrates a wiring diagram of a first embodiment of a wiringconfiguration of the micro switch to the vacuum cleaner of FIG. 9A.

FIG. 14A illustrates a section view of a third embodiment of anexemplary vacuum cleaner of the present disclosure with several elementsomitted for clarity.

FIG. 14B illustrates an enlarged view of the vacuum cleaner of FIG. 14A.

FIG. 15A illustrates a section view of an alternative to the thirdembodiment of an exemplary vacuum cleaner of the present disclosure withseveral elements omitted for clarity.

FIG. 15B illustrates an enlarged view of the vacuum cleaner of FIG. 15A.

FIG. 16 illustrates a flow diagram depicting an exemplary method forinterrupting a power supply to a vacuum cleaner motor in accordance withcertain aspects of the present disclosure.

FIG. 17 illustrates a flow diagram depicting an exemplary method foractivating a power supply to a vacuum cleaner motor in accordance withcertain aspects of the present disclosure.

While the inventions disclosed herein are susceptible to variousmodifications and alternative forms, only a few specific embodimentshave been shown by way of example in the drawings and are described indetail below. The Figures and detailed descriptions of these specificembodiments are not intended to limit the breadth or scope of theinventive concepts or the appended claims in any manner. Rather, thefigures and detailed written descriptions are provided to illustrate theinventive concepts to a person of ordinary skill in the art and toenable such person to make and use the inventive concepts.

DETAILED DESCRIPTION OF THE INVENTION

The Figures described above and the written description of specificstructures and functions below are not presented to limit the scope ofwhat Applicant has invented or the scope of the appended claims. Rather,the Figures and written description are provided to teach any personskilled in the art to make and use the invention for which patentprotection is sought.

Those skilled in the art will appreciate that not all features of acommercial embodiment of the invention are described or shown for thesake of clarity and understanding. Persons of skill in this art willalso appreciate that the development of an actual commercial embodimentincorporating aspects of the present invention will require numerousimplementation-specific decisions to achieve the developer's ultimategoal for the commercial embodiment. Such implementation-specificdecisions may include, and likely are not limited to, compliance withsystem-related, business-related, government-related, and otherconstraints, which may vary by specific implementation, location andfrom time to time. While a developer's efforts might be complex andtime-consuming in an absolute sense, such efforts would be,nevertheless, a routine undertaking for those of skill in this arthaving benefit of this disclosure.

It must be understood that the inventions disclosed and taught hereinare susceptible to numerous and various modifications and alternativeforms. Lastly, the use of a singular term, such as, but not limited to,“a,” is not intended as limiting of the number of items. Also, the useof relational terms, such as, but not limited to, “top,” “bottom,”“left,” “right,” “upper,” “lower,” “down,” “up,” “side,” and the likeare used in the written description for clarity in specific reference tothe Figures and are not intended to limit the scope of the invention orthe appended claims.

The terms “couple,” “coupled,” “coupling,” “coupler,” and like terms areused broadly herein and can include any method or device for securing,binding, bonding, fastening, attaching, joining, inserting therein,forming thereon or therein, communicating, or otherwise associating, forexample, mechanically, magnetically, electrically, chemically, operably,directly or indirectly with intermediate elements, one or more pieces ofmembers together and can further include without limitation integrallyforming one functional member with another in a unity fashion. Thecoupling can occur in any direction, including rotationally.

The term “approximately”—when used in conjunction with the measurementof pressure P1 and pressure P2 (e.g., “P1 is approximately equal toP2”)—is used broadly throughout the disclosure to include measuredpressure values that are equal (e.g., pressure P1 equals pressure P2)and measured pressure values that are within 10% of each other'smeasured values. For example, if P1 is measured at 101.325 kPA, then P2is “approximately equal to” P1 if it is within the range of91.193-111.458 kPA.

Applicant has created systems, methods, and apparatuses for controllingthe power supply of a vacuum cleaner motor. The systems and apparatusesinclude pressure taps to detect a pressure differential within a vacuumcleaner, a float that adjusts depending on an amount of liquid stored,and a power switch that toggles based on the pressure differentialcreated by the position of the float. Alternatively, the float can bereplaced by an air chamber so that the pressure differential is createdby liquid rising above the volume of air trapped in the chamber. Themethod can include interrupting the current supplied to an electricalcircuit of a power switch based upon a pressure differential createdwithin the vacuum. By controlling the power supply to a vacuum cleanermotor based on a pressure differential created by the amount of liquidstored within the vacuum cleaner, the vacuum cleaner can automaticallydisable the vacuum cleaner's motor as the vacuum approaches its maximumliquid capacity.

Turning now to the Figures, FIG. 1A illustrates a schematic side view ofa first embodiment of an exemplary vacuum cleaner of the presentdisclosure with the filter removed for clarity. FIG. 1B illustrates aschematic side view of the vacuum cleaner of FIG. 1A, with a partialcut-away showing a first embodiment of an exemplary, typical filter cageinside the collection drum of a vacuum cleaner with the filter removedfor clarity. These Figures will be described in conjunction within oneanother.

Vacuum 10 can include a collection canister, such as a drum 22(equivalently referred to herein as a collection drum, vacuum body, orbody). The drum 22 can include a bottom, sides, and an open top.Further, vacuum 10 can include a motor cover 12 for covering thevacuum's motor (not shown), a hose 14, and a powerhead 16. In oneexample, the powerhead 16 can be removed from the drum 22 such as bybeing disposed in a configuration where the powerhead 16 is releasablysecured via one or more latches (not shown) over the top of the drum 22.Vacuum 10 can be battery powered, powered through AC or DC electricity,such as through a power cord (not shown). The drum 22 can be circular,cylindrical, or oval in shape, or in the alternative, may be of anothersuitable shape as appropriate, such as square or rectangular, withoutlimitation.

Although not depicted in the Figures, vacuum 10 may, but need not,include a plurality of caster assemblies (not shown) connected tocasters (not shown) and removably or permanently coupled about thebottom region of collection drum 22 via formed drum mounts (not shown).The caster assemblies may be removable or permanently fixed asappropriate for the particular vacuum appliance and its intendedapplications. Furthermore, vacuum 10 can include one or more drumhandles (not shown).

Collection drum 22 may also optionally include a drain plug (not shown)at the bottom of the drum 22 to aid in the removal of liquid debris fromwithin the drum 22. For example, the drain plug may aid with the ease ofdraining liquid debris from the drum 22, aid with the ease in cleaningthe drum 22 once the powerhead 16 has been removed, or facilitate theattachment of a vacuum pump accessory (not shown). Powerhead 16typically can have a handle (not shown) formed onto or into it, asappropriate, and it can house a motor and impeller assembly (not shown)for establishing vacuum pressure within the vacuum cleaner 10 when poweris being supplied to vacuum 10. The handle can include a lever, latch,pivot, or other protuberance or protrusion capable of being grasped by auser's hand.

The hose 14 can include a hose, tube, or other conduit, either flexibleor rigid, and it may be configured so that one end can be inserted intovacuum inlet (not shown) formed in, for example, powerhead 16 or theupper region of collection drum 22, and in fluid connection withpowerhead 16 within the vacuum 10 itself. In one non-limiting embodimentof the present disclosure, hose 14 is simply friction-fit into vacuuminlet (not shown). Similarly and equally acceptable, hose 14 can belock-fitted into vacuum inlet, as appropriate.

While some components may be formed integrally, others may be formedseparately and otherwise coupled together, which may include the use offasteners, such as screws, clips, brackets, adhesives, or othercouplers. Further, where components may be sealingly coupled to oneanother, seals may be coupled there between. Seals may include gaskets,O-rings, sealants, adhesives, or other seals, whether or notspecifically described herein, as will be readily understood by one ofordinary skill having the benefits of the present disclosure.

For purposes of clarity and understanding, one or more of thesecomponents may not be specifically described or shown while,nevertheless, being present in one or more embodiments of the invention,such as in a commercial embodiment, as will be readily understood by oneof ordinary skill in the art.

FIG. 2A illustrates a section view of the vacuum cleaner of FIG. 1A withthe filter removed for clarity. FIG. 2B illustrates an enlarged view ofthe vacuum cleaner illustrated in FIG. 2A. These Figures will bedescribed in conjunction with one another.

Vacuum 10 can further include plenum pressure taps 26 a and 26 b, firstconduits 28 a and 28 b and housing pressure taps 30 a and 30 b. Theplenum pressure taps 26 a and 26 b, first conduits 28 a and 28 b, andhousing pressure taps 30 a and 30 b can be used in conjunction with oneanother, along with the movement of the float 20 as it rises to contactthe inlet plenum 24, to create and measure a pressure differentialwithin the vacuum 10. More specifically, liquid entering the drum 22(such as through the hose 14 illustrated in FIG. 1A) falls to the bottomof the drum 22 as it collects debris. As the drum collects liquids, thefloat 20, being configured to be more buoyant than the liquid collectedin the drum 22, will rise with the liquid being collected. As the float20 contacts the inlet plenum 24, the vacuum inside the drum 22 isinterrupted, thus creating a pressure differential between the drum 22and inlet plenum 24. This pressure differential is measured, in part,with the aid of the above-referenced taps.

Inlet plenum 24 may include one or more openings in fluid communicationwith one another. Inlet plenum 24 may be of single piece construction,but need not be, and may alternatively include a plurality of componentscoupled to one another. Inlet plenum 24 can be fluidly coupled to aportion of the intake to the vacuum motor (not shown) and cage 18, forallowing air to flow there between, as will be further described below.In one example, inlet plenum 24 can be fluidly coupled to cage 18,including being formed integrally therewith, in whole or in part. Cage18 can be tubular, and may be configured to support a filter (notshown), such as receiving a filter there around. Cage 18 can include oneor more openings therein, or in the alternative, it may have an “open”or “slotted” configuration, that may include support members such asribs disposed in horizontal and/or vertical directions with respect tothe cage 18.

Plenum pressure tap 26 a can be located outside the inlet plenum 24. Thepressure tap 26 a can sense the vacuum pressure inside the drum 22. Thispressure is depicted in the Figures as pressure P1. Similarly, pressuretap 26 b can be located inside the inlet plenum 24. The pressure tap 26b senses the vacuum pressure inside inlet plenum 24. This pressure isdepicted in the Figures as pressure P2. When the vacuum 10 is operatingunder “normal” operating conditions (i.e., the drum 22 has collectedlittle or no water P1 is approximately equal to P2. Put simply, withoutthe float 20 partially covering or fully covering inlet plenum 24, airmay flow freely through inlet plenum 24 and into the drum 22, thusequalizing the pressure differential. The pressure P1 and pressure P2,therefore, typically equals one another under “normal” operatingconditions.

As the drum 22 collects liquids and the float 20 rises, eventuallypressure P2 will fall below that of P1 because the float 20 willpartially cover or fully cover the inlet plenum 24 as it rises in thedrum 22 to meet it. That is, the airflow between the inlet plenum 24 andthe drum 22 is impeded. Once this occurs, pressure P2 (which remains ina vacuum condition) will be less than pressure P1 (which now increasesto, at, or near atmospheric pressure after the float 20 fully contactsand covers the inlet plenum 24), thereby causing a pressure differentialbetween pressures P1 and P2.

The pressure P1 and pressure P2 are measured through taps connected toor coupled to the housing 32 (as described in greater detail inconjunction with FIG. 3A) that are coupled with first conduits 28 a and28 b. These first conduits, when described together, are furtherreferenced by this disclosure and illustrated in the Figures as conduit34. Conduit 34, for example, can include a hose, tubing, or any othertype of conduit to allow the flow of air from one point to another.Furthermore, any tubing or conduit that can withstand collapse undertypical pressures exerted within vacuum 10 can be used to aid thehousing's 32 measurement and/or detection of a pressure differentialbetween pressure P1 and pressure P2.

In an exemplary and non-limiting illustrative embodiment, the conduit 34can be replaced with air passageways through various portions of thevacuum 10 (such as its lid (not shown) powerhead 16, etc.). For example,these passageways can be coupled to these other portions of vacuum 10or, in the alternative, be formed as part of those features (such as,for example, through molding of the passageway into the lid).

Referring again to the first conduits 28 a, and 28 b, first conduit 28 acan be used to couple plenum pressure tap 26 a to housing pressure tap30 a, and first conduit 28 b can be used to couple plenum pressure tap26 b to housing pressure tap 30 b. These conduits and their respectivefunctions and couplings are described in greater detail below inconjunction with several of the Figures (e.g., FIGS. 3A-3D).

FIG. 3A illustrates an enlarged view of the vacuum cleaner illustratedin FIG. 2B with several elements omitted for clarity in an exemplaryconfiguration where pressure P1 is approximately equal to P2. FIG. 3Billustrates an enlarged cross-sectional view of the vacuum cleanerillustrated in FIG. 3A with several elements omitted for clarity in anexemplary configuration where pressure P1 is greater than pressure P2.FIG. 3C illustrates a non-sectioned view of the vacuum cleanerillustrated in FIG. 3B with several elements omitted for clarity. FIG.3D illustrates a detail view of FIG. 3A with the spring cap released andthe actuator and switch in the “off” position. These Figures will bedescribed in conjunction with one another.

Housing 32 can include an upper housing 36 and lower housing 38. Theupper housing 36 and lower housing 38 can include housing pressure taps30 b and 30 a, respectively. Conduit 34 can be coupled to the pressuretaps such that first conduit 28 a is coupled to housing pressure tap 30a and first conduit 28 b is coupled to housing pressure tap 30 b. Inother words, first conduit 28 a can be coupled to both plenum pressuretap 26 a (as shown in FIG. 2B) and housing pressure tap 30 a in order todetect and measure pressure P1. Similarly, first conduit 28 b can becoupled to both plenum pressure tap 26 b (As shown in in FIG. 2B) andhousing pressure tap 30 b in order to detect and measure pressure P2. Inthis particular configuration, thus, pressure P1 can be measured fromlower housing 38 and pressure P2 can be measured from upper housing 36.

Additional details of the upper housing 36 are illustrated in FIGS.4A-4C. FIG. 4A illustrates a front view of the upper housing illustratedin FIG. 3A with several elements omitted for clarity. FIG. 4Billustrates a side view of the upper housing illustrated in FIG. 4A withseveral elements omitted for clarity. FIG. 4C illustrates an isometricview of the upper housing illustrated in FIG. 4A with several elementsomitted for clarity. These Figures will be described in conjunction withone another.

Upper housing 36 can include a stem area 42, one or more stops 60, and astem support 74. Referring to a side view of upper housing 36 (e.g.,FIG. 4B), stem support 74 can further include slot 68. For example, slot68 can include a portion of stem area 42 that is cut away or removedfrom the remainder of stem area 42. Stem support 74 can include asupport or other brace, foundation, or fixture for supporting stem area42. Stem support 74 can take the form of various shapes and sizes. Forexample, in an exemplary and non-limiting illustrative embodiment, stemsupport 74 can take the form of a cylinder with a uniform radius andwith its height extending orthogonally along an axis away from upperhousing 36. Other configurations, such as other geometric shapes andsizes for stem support 74, are contemplated as well.

Further extending away from upper housing 36 are one or more flexibletabs 50, each including one or more catches 52. Catch 52 can include anyguide, hook, loop, or other device for catching, receiving, guiding,holding, or restraining the spring cap 48 (as shown in FIG. 6B) andsecond shoulder 54 (as shown in FIG. 6B) as will be described in greaterdetail below. As the position of plunger 76 adjusts with respect toupper housing 36 (i.e., moves towards or away from upper housing 36),flange 62—when disposed between the outer edges of slot 68—can slidealong the channel formed by the slot 68 in order to restrict theplunger's 76 degrees of freedom of movement. That is, the plunger's 76movement can be limited to movement along a vertical axis with respectto the upper housing 36. This movement is described in greater detailbelow.

Further, upper housing 36 can include housing pressure tap 30 b. Asdescribed in greater detail below, housing pressure tap 30 b can be usedto measure pressure P2 in inlet plenum 24 (as shown in FIG. 2A) andcompare it with pressure P1 as measured by housing pressure tap 30 a(e.g., FIG. 3A) disposed on or coupled to lower housing 38 (e.g., FIG.3A) as described in greater detail below.

Additional details of the lower housing 38 are illustrated in FIGS. 5Aand 5B. For example, FIG. 5A illustrates a front-side view of the lowerhousing illustrated in FIG. 3A, and FIG. 5B illustrates an isometricview of the lower housing illustrated in FIG. 3A. These Figures will bedescribed in conjunction with one another.

Lower housing 38 can be formed separately with the housing pressure tap30 a, or in the alternative, it can be formed (such as through injectionmolding or other molding-type manufacturing processes) as a single,monolithic unit. The lower housing 38 can take various shapes and sizes.For example, lower housing 38 can take the shape of flat disc, plate, orother shape adapted to secure membrane 40 (as shown in FIG. 3A) betweenit and upper housing 36 (as shown in FIG. 3A).

Returning to FIGS. 3A-3D, Membrane 40 can be disposed between upperhousing 36 and lower housing 38. Membrane 40 can include a flexiblediaphragm, dividing membrane, or any other sheet, disk, or the likeadapted to adjust its position (i.e., flex) when exposed to a pressuredifferential between its upper and lower portions. In one example,membrane 40 can be disposed in a configuration such that only the outerperimeter of membrane 40 is coupled to the upper housing 36 and lowerhousing 38, thus permitting the portions (such as, for example, innerportions) of membrane 40 to flex freely in a direction towards the upperhousing 36, the lower housing 38, or both. For example, in thisconfiguration, the center section of membrane 40 can flex upward ordownward depending on the pressure differential between pressure P1 andpressure P2.

Referring to the “normal” operating conditions described above, when thedrum 22 (as shown in FIG. 1A) has collected little or no water), P1 isapproximately equal to P2. When P1 equals P2, pressure P1 will exert apressure on the lower portion of membrane 40 and pressure P2 will exerta pressure on the upper portion of membrane 40 at particular magnitudesthat are approximately equal. Thus, under “normal” operating conditions,membrane 40 will remain in its “normal,” unflexed position (i.e.,neither will be flexing towards the upper housing 36 nor towards thelower housing 38). This particular configuration is specificallyillustrated in FIG. 3A.

The upper housing 36 can further include a stem area 42 that can furtherinclude a first shoulder 46. The stem area 42 can further include abiasing device 44, such as a spring (e.g., compression spring), or otherdevice for storing and releasing compressive and/or elastic forces. Inone particular configuration, the biasing device 44 can rest against oneside of the first shoulder 46 while the opposite side of the biasingdevice 44 can be pressed against spring cap 48. Although spring cap 48can be employed to restrain the movement of the biasing device 44 whilebiasing device 44 is embodied as a spring, other biasing devices—otherthan a spring—are contemplated as well. In those alternativeembodiments, spring cap 48 can be equally employed to restrain biasingdevice 44.

Additional details of spring cap 48 (and select related components) areillustrated in FIGS. 6A and 6B. FIG. 6A illustrates a side view of thespring cap illustrated in FIG. 3A. FIG. 6B illustrates an isometric viewof the spring cap illustrated in FIG. 3A. These Figures will bedescribed in conjunction with one another.

Spring cap 48 can include second shoulder 54, flexible member 56, andthird shoulder 58. These components can be formed separately and coupledtogether, or in the alternative, they can be formed as a single unit,such as through a molding-based manufacturing process. These componentscan be formed from plastic, metal, composite, or another material. Forexample, flexible member 56 can be formed from an injection moldedplastic such that it is adapted to flex towards and away from spring cap48 to hold spring cap 48 in place as described in greater detail below.Second shoulder 54 can be coupled to an edge (e.g., a terminating edge)of spring cap 48 in order to couple to and decouple from flexible tabs50 (as shown in FIG. 3C).

Second shoulder 54 can be configured to resist flexing as the spring cap48 adjusts its position. In this configuration, flexible tabs 50 (asshown in FIG. 3C), rather than second shoulder 54, can adjust theirposition to couple to and decouple from second shoulder 54 in order tosecure the position of spring cap 48. Moreover, third shoulder 58 can becoupled to a terminating edge of flexible member 56 such that asflexible member 56 flexes towards and away from spring cap 48, and thirdshoulder 58 can coupled to and decouple from stops 60 (as shown in FIG.3C) and described in greater detail below.

Returning to FIGS. 3A-3D, spring cap 48 can be disposed such that itfits over stem 42, for example, though a sliding configuration. Further,spring cap 48 can be coupled to and secured and/or held on to stem area42 through the aid of flexible tabs 50 of the upper housing 36. Forexample, as the spring cap 48 is installed, the flexible tabs 50 canadjust their position such that they clear or flex their way out of thesecond shoulder 54. As the installation process is continued and springcap 48 is moved further downward along stem 42, catches 52 of theflexible tabs 50 “snap over” or position themselves over secondshoulders 54, such that catches 52 create an abutment against secondshoulders 54 and, thus, retaining spring cap 48 onto stem 42.

The flexible members 56 can be used to secure and hold spring cap 48 ina “cocked” position during “normal” vacuum operation. When in this“cocked” position, spring cap 48 compresses biasing device 44, and issecured by third shoulder 58 of the flexible members 56 and is coupledto—for example, abutting against—stops 60 on stem area 42 of upperhousing 36. Therefore, when spring cap 48 is pushed down toward this“cocked position,” flexible members 56 can flex over stops 60 and “snap”into the “cocked” position.

Below the stem area 42 of the upper housing 36 is a stem support 74.Stem support 74 can be used to install plunger 76 on the stem support sothat plunger 76 can vertically traverse the stem support 74 (forexample, through a sliding motion upwardly and downwardly with respectto the stem support 74). In this example, flange 62 can move up and downwithin slots 68 of the stem area 42. When P2 is less than P1 (forexample, when drum 22 (as shown in FIG. 1A) fills with liquid and float20 (e.g., FIG. 1A) contacts inlet plenum 24 (e.g., FIG. 1A)), membrane40 flexes upwards towards upper housing 36 and against plunger 76. Thisconfiguration is illustrated in particular by FIG. 3B. Disposed on aportion of the plunger 76 (e.g., on the top portion) is a flange 62.Although depicted in the Figures as two separated parts (e.g., FIG. 3B),plunger 76 and flange 62 can be configured as a single monolithicstructure or component. In one example, these two components can bemolded and/or formed as one, single component.

Additional details of the plunger 76 and flange 62 are illustrated inFIG. 7. FIG. 7 illustrates an isometric view of the plunger and flangeillustrated in FIG. 3A. Flange 62 can include any tab, projection,protuberance, lip, or the like. For example, flange 62 can include oneor more projections extending away from a surface of plunger 76. Flange62 can include flange surface 78 that can be adapted to make contactwith flexible members 56 (as shown in FIG. 3B) for releasing spring cap48 from the “cocked position” (as shown in FIG. 3B) and described ingreater detail below.

Returning to FIGS. 3A-3D, as upper portion of membrane 40 contacts thelower portion of plunger 76, the plunger 76 rises and thus, flange 62 iscaused to rise upwardly with respect to housing 32. As flange 62 rises,flange surface 78 of the flange 62 contacts the flexible members 56 ofspring cap 48 (e.g., abuts against spring cap 48) and forces theflexible members 56 of the spring cap 48 in an outwardly direction. Asthese flexible members 56 flex outward, third shoulders 58 are movedoutwardly such that they disengage from the stops 60, thus releasing thespring cap 48 from its “cocked” position. (see, e.g., FIGS. 3B and 3C).Once disengaged, the biasing device 44 can force the spring cap 48upwardly thus contacting the actuator 64 (e.g., abutting actuator 64)moving it to an “off” position.

As the actuator 64 moves to the “off” position, it forces power switch66 to move from an “on” position to an “off” position. Once disposed inthe “off” position, the power supply to the vacuum's motor (not shown)is disrupted (i.e., de-energized), thus the vacuum 10 (as shown in FIG.1A) is turned off. The actuator 64 can be disposed at least partially onthe exterior of the drum 22 (e.g., FIG. 1A) so that a user can accessand/or manipulate the actuator 64 without opening or removing anycomponents from the vacuum 10 (as shown in FIG. 1A).

FIG. 3D depicts the vacuum 10 (e.g., FIG. 1A) in the “off” position.Notably, the actuator 64 has forced the power switch 66 to this “off”position as a result of the releasing of the spring cap 48 that wasforced in the direction of the actuator 64 as the compression in thebiasing device 44 was released. Once the spring cap 48 is released, itis disposed in the “un-cocked” position as depicted in FIG. 3D.

Referring back to FIG. 1A, with the vacuum 10 in the “off” position, auser may more easily removed the liquid from the drum 22 to dispose ofits contents. Once removed, the float 20 will return to a position suchthat it does not contact inlet plenum 24, thus minimizing the pressuredifferential between pressure P1 and pressure P2 when the vacuum 10 isenergized. When the user wishes to turn the vacuum 10 back to the “on”position, the user can manually manipulate the position of the actuator64 (by moving the actuator from the “off” position as shown in FIG. 3Dto the “on” position as shown in FIG. 3A). That is, by physicallyrepositioning the actuator 64, the power switch 66 can similarly berepositioned to control the power supply to the vacuum 10.

Referring again to FIGS. 3A-3D, as the user repositions the actuator 64,the configurations of the spring cap 48, the flexible members 56, andthe like are reversed from the process described above. In other words,as the actuator 64 contacts and/or abuts against the spring cap 48, itforces it downward. Moreover, as the spring cap 48 is pushed down towardthe “cocked” position, the biasing device 44 is compressed and flexiblemembers 56 flex over stops 60. As this occurs, third shoulders 58 can“snap” over stops 60.

When in the spring cap 48 is in its “cocked” position, it can compressbiasing device 44. The compressed biasing device 44 can remaincompressed because it now, in its “cocked” position, is held down bythird shoulders 58 of the flexible members 56 abutting against stops 60on the stem area 42 of the upper housing 36. Once positioned inaccordance with the configuration, spring cap 48 can remain in itsposition for “normal” vacuum operation because pressures P1 and P2 willremain approximately equal until such a time as the float 20 (e.g., FIG.2A) contacts or approaches inlet plenum 24 (e.g., FIG. 2A) creating apressure differential between pressure P1 and pressure P2.

Further, as spring cap 48 is pushed down, spring cap 48 contacts and/orabuts against flange 62, thus pushing plunger 60 in a downwardlydirection. This repositioning allows plunger 60 to move freely back downto its “normal” resting position. As noted above, once drum 22 (e.g.,FIG. 1A) is emptied, pressure P1 will be approximately equal to P2.Accordingly, membrane 40, without experiencing a significant pressuredifferential between its lower and upper surfaces, is free to return toits un-flexed position (as shown, for example, in FIG. 3A).

Referring specifically to FIG. 3A, housing 32 can be disposed at variouslocations on vacuum 10, such as at a location proximate to actuator 64(i.e., to cause components associated with the housing 32 to adjust theactuator 64 to reposition the power switch 66 from the “on” to “off”positions). Further, the position of housing 32 (and its relatedcomponents) can be adjusted through the aid of the mounting boss 70 andmounting coupler 72. Mounting boss 70 can include an area or void forreceiving the mounting coupler 72. Mounting coupler 72 can include ascrew, snap, hook, button, catch, clasp, bolt, or any other fastener forcoupling a portion of vacuum 10 to housing 32 to secure it in place.With the aid of these components, the housing 32 can be secured to orcoupled with the vacuum 10 at various locations (e.g., on the lid (notshown)).

The vacuum cleaner 10 described in connection with FIGS. 1A-7 may beconfigured to take alternative forms and designs as well. For example,the vacuum 10 as disclosed in FIGS. 1A-7 can be configured in thealternative such that the power supplied to the vacuum cleaner can becontrolled through the use of a micro switch 238 (e.g., FIG. 9A). Inthis configuration, the vacuum's 10 biasing device 44, spring cap 48,catch 52, actuator 64, etc. (as shown, for example, in FIG. 3A) can beomitted and replaced with a micro switch 238 (e.g., FIG. 9A) and otherrelated components that can be used in conjunction to create a similareffect—i.e., turn off the power supply to the vacuum's 10 motor (notshown). In this modified configuration, the pressure differentialbetween pressure P1 and pressure P2 (as described in conjunction withFIGS. 1A-7, can be used to trigger the micro switch 238 and raise areset shaft 214 (e.g., FIG. 9A) used to turn off the power supply to thevacuum's 10 motor (not shown). These particular embodiments may bebetter understood with reference to FIGS. 8-13 in combination with thedetailed description of specific embodiments presented herein.

For FIGS. 8-13, many, but not all, of the illustrated features of thedescribed inventions share features with the embodiments described inFIGS. 1A-7, above. For example, referring specifically to FIG. 9A, theexemplary vacuum cleaner 110 illustrated in this Figure shares manycommon elements with the exemplary vacuum cleaner 10 in FIGS. 1A and 1B(e.g., motor cover 12, hose 14, powerhead 16, cage 18, float 20, drum22, inlet plenum 24, etc.). All of these features are described indetail with reference to FIGS. 1A-7 and thus, in the interest of clarityand brevity, will not be repeated for the description for FIGS. 8-13.

Moreover, several features described with reference to FIGS. 1A-7 areillustrated in one or more of FIGS. 8-13, but not specifically labeledfor these embodiments. One of ordinary skill in the art, therefore,would understand that similar features illustrated in FIGS. 8-13 sharecommon features, descriptions, embodiments as those features illustratedand described with reference to FIGS. 1A-7. Although the portions of thedisclosure describing FIGS. 8-13 mainly focus on the differences ofthose elements previously described with reference to FIGS. 1A-7, one ofordinary skill in the art would recognize that one or more of theelements described in reference to FIGS. 8-13 can be similarly embodied,where appropriate, as those elements described in reference to FIGS.1A-7.

FIG. 8 illustrates a schematic side view of a second embodiment of anexemplary vacuum cleaner of the present disclosure with the filterremoved for clarity. FIG. 9A illustrates a schematic side view of asecond embodiment of an exemplary vacuum cleaner of the presentdisclosure. FIG. 9B illustrates a section view of the vacuum cleaner ofFIG. 9A with the switch and reset shaft not sectioned for clarity and inan exemplary configuration where pressure P1 is approximately equal topressure P2. FIG. 9C illustrates a section view of the vacuum cleaner ofFIG. 9A with the switch and reset shaft not sectioned for clarity and inan exemplary configuration where pressure P1 is greater than pressureP2. These Figures will be described in conjunction with one another.

In addition to many of the components described in FIGS. 1A and 1B abovewith reference to vacuum 10, vacuum 110 can further include conduit 134(that can be more specifically labeled first conduits 128 a and 128 b)and housing pressure taps 130 a and 130 b. The first conduits 128 a and128 b and housing pressure taps 130 a and 130 b can be used inconjunction with one another, along with the movement of the float 120as it rises to contact the inlet plenum (not shown) to create andmeasure a pressure differential with the vacuum 110. More specifically,as liquid enters the drum 122, the liquid falls to the bottom of thedrum 122 as it collects debris. As the drum 122 collects liquids, thefloat 120, being configured to be more buoyant than the liquid collectedin the drum 122, will rise with the liquid being collected. As the float120 contacts the inlet plenum (not shown), the vacuum inside the drum122 is interrupted, thus creating a pressure differential between thedrum 122 and inlet plenum (not shown). This pressure differential ismeasured, in part, through the aid of the above-referenced taps.

For example, first conduit 128 a can be coupled to housing pressure tap130 a at a location that is disposed below the lower surface of membrane140. In this location, housing pressure tap 130 a can sense the pressureP1 inside drum 122. Further, first conduit 128 b can be coupled tohousing pressure tap 130 b at a location that is disposed above theupper surface of membrane 140. In this location, housing pressure tap130 b of upper housing 136 can sense the pressure P2 exerted on or nearinlet plenum 24—i.e., inside the inlet plenum 24.

When the vacuum 110 is operating under “normal” operating conditions(i.e., the drum 122 has collected little or no water) P1 isapproximately equal to P2. That is, without the float 120 partiallycovering or fully covering inlet plenum (not shown), air may flow freelybetween the inlet plenum (not shown) and the drum 122, thus equalizingthe pressure differential. The pressure P1 and pressure P2, therefore,typically equal one another under “normal” operating conditions.

As the drum 122 collects liquids and the float 120 rises, eventuallypressure P2 will fall below that of P1 because the float 120 willpartially cover or fully cover the inlet plenum (not shown) as it risesin the drum 122 to meet it. That is, the airflow between the inletplenum (not shown) and the drum 122 is impeded. Once this occurs,pressure P2 (which remains in a vacuum condition) will be less thanpressure P1 (which now increase to, at, or near atmospheric pressureafter the float 120 fully contacts and covers the inlet plenum (notshown)), thereby causing a pressure differential between pressures P1and P2.

The pressure P1 and pressure P2 are measured through taps connected toor coupled with the housing 132 (as described in greater detail inconjunction with FIGS. 8-9C) through first conduits 128 a and 128 b.These first conduits, when described together, can be referred tocollectively as conduit 134. Conduit 134, for example, can include ahose, tubing, or any other type of conduit to allow the flow of air fromone point to another. Furthermore, any tubing or conduit that canwithstand collapse under typical pressures exerted within vacuum 110 canbe used to aid the housing's 132 to measurement and/or detection of apressure differential between pressure P1 and pressure P2.

The housing 132 can be disposed at any location on the motor cover 112to allow a user the ability to access the reset surface 216 (asdiscussed in greater detail below) from an exterior surface of drum 122.Further, the housing 132 can include an upper housing 136 and a lowerhousing 138. The upper housing 136 and the lower housing 138 can includethe housing pressure taps 130 b, and 130 a, respectively.

Additional details of the upper housing 136 are illustrated in FIGS.11A-11D. FIG. 11A illustrates a side view of the upper housingillustrated in FIG. 9A. FIG. 11B illustrates a left isometric view ofthe upper housing illustrated in FIG. 9A. FIG. 11C illustrates a topview of the upper housing illustrated in FIG. 9A. FIG. 11D illustrates aright isometric view of the upper housing illustrated in FIG. 9A. TheseFigures will be described in conjunction with one another.

Upper housing 136 can include a stem support 142, support area 220, andflexible stop member 230 that can include flexible stop member surface232. Further, upper housing 136 can include flexible holding member 244that can include a surface of flexible holding member 246. Referringspecifically to FIGS. 11B and 11D, upper housing 136 can further includemicro switch mounting area 240, one or more slots 226 and bearing area222 disposed on or near support area 220, and surface of stem area 250.Switch mounting area 240 can include any brace, bracket, support, orother fixture for supporting micro switch 238.

The one or more slots 226 can define a portion of support area 220 thatis cut away or removed from the remainder of support area 220. Supportarea 220 can include a support or other brace, bracket, foundation, orother fixture for supporting one or more features of upper housing 136,such as, for example, flexible stop member surface 232. Stem support 142can take the form of various shapes and sizes. For example, in anexemplary and non-limiting illustrative embodiment, stem support 142 cantake the form of a cylinder with a uniform radius with its heightextending orthogonally along an axis away from upper housing 136. Otherconfigurations for stem support 136 are contemplated as well (such asother regular or non-regular geometric shapes).

One or more slots 226 and bearing area 222 can form a cut-away sectionof support area 220 for receiving reset shaft 214 (as shown in FIG.10C). For example, reset shaft 214 may be slidably received through oneor more slots 226 and bearing area 222, and seated within or coupled tostem support 142 so that a bottom portion of reset shaft 214 can becoupled to (i.e., abut) the surface of stem support 250. As the resetshaft 214 adjusts its position with respect to upper housing 136 (forexample, as it moves towards and away from the upper surface of upperhousing 136), the walls of reset shaft 228 (as shown in FIG. 10C) movein a direction such that they remain adjacent to slots 226. Thismovement is described in greater detail below.

As reset shaft 214 (e.g., as shown in FIG. 10C) adjusts its positionthrough one or more slots 226 and bearing area 222, flexible stop member230 and flexible holding member 244 can adjust their positions throughflexing such that flexible stop member surface 232 and surface offlexible holding member 246 can be coupled to and decoupled fromportions of reset shaft 214 to prevent its movement in one or moredirections. These features are described in greater detail below.

Further, upper housing 136 can include housing pressure tap 130 b. Asdescribed in greater detail below, housing pressure tap 130 b can beused to measure a pressure P2 in inlet plenum (not shown) and compare itwith pressure P1 as measured by housing pressure tap 130 a (e.g., FIG.9A) disposed on or coupled to lower housing 138 (e.g., FIG. 9A) asdescribed in greater detail below.

Additional details of the lower housing 138 are illustrated in FIGS. 12Aand 12B. For example, FIG. 12A illustrates a side view of the lowerhousing illustrated in FIG. 9A. FIG. 12B illustrates an isometric viewof the lower housing illustrated in FIG. 9A. These Figures will bedescribed in conjunction with one another.

Lower housing 138 can be formed separately with the housing pressure tap130 a, or in the alternative, it can be formed (such as throughinjection molding or other molding-type manufacturing process) as asingle, monolithic unit. The lower housing 138 can take various shapesand sizes. For example, lower housing 138 can take the shape of flatdisc, plate, or other shape adapted to secure membrane 140 (as shown inFIG. 9B) between it and upper housing 136 (as shown in FIG. 9B).

Returning to FIGS. 8-9C, membrane 140 can be disposed between upperhousing 136 and lower housing 138. Membrane 140 can include a flexiblediaphragm, dividing membrane, or any other sheet, disk, or the likeadapted to adjust its position (i.e., flex) when exposed to a pressuredifferential between its upper and lower portions. In one example,membrane 140 can disposed in a configuration such that only outerperimeter of membrane 140 is coupled to the upper housing 136 and lowerhousing 138, thus permitting the inner portions of membrane 140 to flexfreely in a direction towards the upper housing 136, the lower housing138, or both. For example, in this configuration, the center section ofmembrane 140 can flex upward or downward depending on the pressuredifferential between pressure P1 and pressure P2.

The upper housing 136 can include a stem support 142. In one example,the stem support 142 is a cylindrically shaped area for supporting resetshaft 214, although other shapes, sizes, and configurations arecontemplated as well. On one end of the reset shaft 214 can include astem insert area 212. This stem insert area 212 can install the stemsupport 142, and be disposed such that it may move—for example through asliding or gliding motion—in an upwardly and downwardly motion. A resetsurface 216 can be disposed on the other end of the reset shaft 214opposite to the end of the stem insert area 212. The reset shaft 214 canbe employed as a reset button as will be described in greater detailbelow in conjunction with FIGS. 9C-10C.

FIG. 10A illustrates a side view of the reset shaft illustrated in FIG.9C. FIG. 10B illustrates a section view of the reset shaft illustratedin FIG. 9C taken along section line A-A of FIG. 10A. FIG. 10Cillustrates an isometric view of the reset shaft illustrated in FIG. 9C.These Figures will be described in conjunction with one another.

The reset shaft 214 can include a reset surface 216, reset surface end224, first stop shoulder 218, stem insert area 212, walls of reset shaft228, second stop shoulders 248, and holding shoulder 242. The resetshaft 214 can be implemented as a one-way design such that it can beconfigured to only move in a single direction—upwardly—without requiringthe manual intervention from a user. In this configuration, the resetshaft 214 can still move in the downward direction, but as described ingreater detail below, when configured with a one-way design, userintervention is required to ensure the reset shaft 214 is moved back ina downwardly direction.

The upper housing 136 (e.g., FIG. 9A) can further include a support area220 (e.g., FIG. 9A) that can include a bearing area 222 (e.g., FIG. 11B)to provide upper support for, and allow sliding clearance for, the resetsurface end 224 of the reset shaft 214.

The cross section of reset surface end 224 can be implemented in aplus-shaped (“+”) configuration (e.g., as shown in FIG. 10B). In otherembodiments, the reset shaft 214 can take other suitable forms as well.The plus-shaped design can serve multiple purposes. First, it canprovide for molding-based manufacture so that it can be easily formedand manufactured as a single monolithic piece. Secondly, thisconfiguration can resist against any rotation (e.g., twisting orturning) about its vertical axis (for example, referring specifically toFIG. 10C, the axis drawn from stem insert area 212 up to reset surface216). To further resist this rotation, bearing area 222 can includeslots 226 that correspond with the walls of reset shaft 228 of thisplus-shaped configuration of the reset surface end 224. The slots 226can contact (e.g., abut) against the walls of reset shaft 228 to keepthe reset shaft 214 from rotating.

Referring to FIG. 9A in conjunction with FIGS. 10A-100, support area 220can include a flexible stop member 230. In this configuration, flexiblestop member 230 can flex over first stop shoulder 218 and be secured(e.g., through a snap-like action) into its position as the first stopshoulder 218 moves—e.g., in a downwardly direction—past flexible stopmember 230. In this configuration, the first stop shoulder 218 canprevent the reset shaft 214 from moving farther (e.g., in an outwardlyor upwardly direction) as it contacts flexible stop member surface 232of flexible stop member 230. That is, flexible stop member 230 willresist any further movement of reset shaft 214 because first stopshoulder 218 will be unable to move beyond flexible stop member surface232 of flexible stop member 230. Reset shaft 214 can additionally resistmovement in a downwardly direction as well. For example, reset shaft 214can include second stop shoulders 248 that can contact (e.g., abut orbump up against) the surface of stem support 250 to limit the maximumdistance reset shaft 214 can travel in a downwardly direction.

Disabling the Power Supply

Referring specifically to FIG. 9C, when pressure P2 is less thanpressure P1 (e.g., in a similar manner as described in conjunction withFIGS. 1A-7), membrane 140, experiencing this pressure differential, canexpand in the direction towards upper housing 136 and stem insert area212. As membrane 140 expands and contacts insert area 212, insert area212 also rises, which in turn, can cause reset shaft 214 to rise aswell. As reset shaft 214 rises, micro switch shoulder 234 moves in anupwardly direction such that its upper edge contacts (e.g., bumps intoand/or abuts) plunger actuator 236 of micro switch 238. In one example,micro switch 238 can include a snap-action switch, so that an electricalcircuit within micro switch 238 can be disabled as the micro switch 238is triggered (e.g., as the plunger actuator 236 moves in the directionof micro switch 238). In other words, as the micro switch shoulder 234contacts the plunger actuator 236, it can cause the plunger actuator 236to move inwardly (i.e., inboard) toward the body of micro switch 238.

Micro switch 238 can be coupled to the upper housing 136 (e.g., throughmounting or other type of coupling) on the micro switch mounting area240. As the plunger actuator 236 moves inwardly, it triggers the microswitch 238 by opening an electrical circuit (i.e., causes contacts ofthe electrical circuit contained within the micro switch 238 to open,thus interrupting the electrical current flowing to the main vacuumswitch (not shown). This interruption in current, in turn, interruptsthe electrical current flowing to the vacuum motor (not shown), thusturning the vacuum 110 off.

FIG. 13 illustrates a wiring diagram of a first embodiment of a wiringconfiguration of the micro switch to the vacuum cleaner of FIG. 9A. Thecircuit 260 can include a vacuum motor 262, a first electrical conduit264, a main vacuum switch 266, a second electrical conduit 268, a microswitch 238, a third electrical conduit 270, a power supply cord 272, anda fourth electrical conduit 274.

When vacuum motor 262 is energized, it can cause a blower wheel (notshown) to rotate. The vacuum motor 262 can include any device capable ofconverting electrical energy into mechanical energy. In the exampleillustrated in this Figure, the circuit 260 is designed as a “normallyclosed” circuit model. That is, vacuum motor 262 is powered unless oneof the main vacuum switch 266 or micro switch 238 are open. Aspreviously discussed, micro switch's 238 default configuration is in theclosed position. That is, micro switch 238 will only be in the openposition if acted upon by plunger actuator 236 (as shown in FIG. 9C). Inthis configuration (with micro switch's 238 default position as being“closed”), under “normal conditions,” the main vacuum switch 266 can beused to energize or deenergize the vacuum motor 262 (i.e., turn on andoff, respectively). However, as the plunger actuator 236 (e.g., FIG. 9C)contacts micro switch 238, micro switch 238 “opens,” thus disrupting thecurrent flow through circuit 260. This, in turn, will interrupt theelectrical current flowing to the main vacuum switch 266, thus poweringdown the vacuum motor 262.

In this configuration, the components of circuit 260 are wired in serieswith main vacuum switch 266. For example, first electrical conduit 264can be disposed between the vacuum motor 262 and the main vacuum switch266. This conduit can carry a current load to ensure electricalcontinuity between the main vacuum switch 266 and vacuum motor 262.Second electrical conduit 268 can be disposed between the main vacuumswitch 266 and micro switch 238. This conduit can carry a current loadto ensure electrical continuity between these two elements. Thirdelectrical conduit 270 can be disposed between the power supply cord 272and micro switch 238. This conduit can carry a current load to ensureelectrical continuity between these two elements. Lastly, fourthelectrical conduit 274 can be disposed between the power supply cord 272and vacuum motor 262. This conduit can help to complete the circuitbetween the power supply cord 272 and vacuum motor 262.

The four electrical conduits described above can include any wire,filament, cable, coil, line, or other electrically conductive strand forcarrying current from one point on circuit 260 to another. For example,each of the four electrical conduits described above can include simpleelectrical wires for conducting electricity. Further, each of theswitches described above can include any switch or toggle for eitheropening or closing an electrical circuit. For example, main vacuumswitch 266 can be embodied as the main switch 66 (as shown in FIG. 3D),or in the alternative, main vacuum switch 266 can be embodied as anyother switch capable of being positioned in either an “on” or “off”position. Power supply cord 272 can include any conduit for supplyingpower (either alternating current (AC) or direct current (DC)) from apower supply to the circuit 260. For example, power supply cord 272 caninclude a standard power supply cord adapted to be compatible with astandard 110V (or, in the alternative, 220V) electrical socket.

Referring again to FIG. 9A, as reset shaft 214 rises, reset surface 216and holding shoulder 242 rise as well (e.g., FIG. 9C depicts an exampleof reset surface 216 after it has risen, for example, as a result ofmembrane 140 expanding and causing stem insert area 212 and reset shaft214 to rise). After reset shaft 214 has risen, at least a portion ofreset surface 216 can be disposed on an outer surface of a vacuum 110.Because at least a portion of reset surface 216 is now disposed on anouter surface of the vacuum 110, it can be accessible to a user to serveas a reset feature (e.g., reset button) that is held in place, in part,by the flexible holding member 244 located on the upper housing 136.

More specifically, as reset shaft 214 rises, it can cause flexibleholding member 244 to expand and flex over holding shoulder 242. As aresult, reset shaft 214 can be held into place after it flexes overholding shoulder 242 through a snapping-motion (i.e., it snaps intoplace and is securely held such that holding shoulder 242 can preventmovement in the downwardly direction). Once in this configuration, thesurface of flexible holding member 246 contacts (e.g., abuts) againstholding shoulder 242 and thus the reset shaft 214 is held in place in a“tripped” position. In other words, the reset shaft 214 is considered tobe in a “tripped” position when the plunger actuator 236 causes theelectrical circuit in the micro switch 238 to open the circuit anddisrupt the flow of current in the micro switch 238. FIG. 9C illustratesan example of when the reset shaft 214 is in the “tripped” position.

Resetting the Power Supply

In order to return the flow of current to the vacuum motor (not shown),a user can depress the reset surface 216 in a downwardly direction tolower the reset shaft 214, causing the micro switch shoulder 234 todisengage contact from the plunger actuator 236, thus closing theelectrical circuit within micro switch 238. In one example, the surfaceof flexible holding member 246 is specially angled, and thus, bydepressing the reset surface 216, the position of flexible holdingmember 244 can be adjusted such that the flexible holding member 244 canflex out of the way of holding shoulder 242 and allow the reset shaft214 to lower back down to its “normal” condition or configuration. Inthis configuration, the vacuum (not shown) has now been “reset.”Typically, the user resets the vacuum (not shown) after the drum hasbeen emptied (i.e., to restore the pressure differential betweenpressure P1 and pressure P2 such that they are approximately equal. Once“reset,” the vacuum 110 can return to its “normal” operating condition.

Further, plunger actuator 236 of micro switch 238 can be biased, such asby including a spring-loaded device. In this configuration as the microswitch shoulder 234 lowers and decouples from the plunger actuator 236,the plunger actuator 236 can be forced back to its original position(i.e., moved away from micro switch 238) based on an internal biasing inthe vertical direction. In this configuration, plunger actuator 236 can“snap-back” to its normal, resting condition. In another example, microswitch 238 can be configured such that it may return to its originalposition on its own by falling away from the micro switch 238 under theforce of gravity. That is, if the switch shoulder 236 is not contactingthe plunger actuator 236, the plunger actuator will be unable to resistthe force of gravity and thus it will fall back to its originalposition. Once in its original, “normal” condition, the electricalcircuit (not shown) contained within the micro switch 238 will close,thus allowing the flow of electrical current to the vacuum 110. Asdescribed in greater detail above, FIG. 13 describes how the position ofthe plunger actuator 236 can affect the flow of electrical current tothe vacuum 110.

The vacuum cleaner 110 described in connection with FIGS. 8-13 may beconfigured to take alternative forms and designs as well. For example,the vacuum 110 as disclosed in FIGS. 8-13 can be configured in thealternative such that a pressure differential is created within thevacuum drum 122 by a volume of air trapped within an “air-trap” disposedwithin the drum 122. This increased pressure experienced within theair-trap is a result of the rising water stored in the drum. In thisconfiguration, the vacuum's 110 float 120 (as shown in FIG. 8) and inletplenum (not shown) can be omitted and replaced with an air-trap (e.g.,air-trap 452 a as shown in FIG. 14B) and other related components thatcan be used in conjunction with one another to measure a pressuredifferential created by rising liquid stored in the vacuum's drum 122.In this modified configuration, micro switch 238, reset shaft 214 andrelated components (as described, for example, in FIGS. 8-13) can betriggered and reset in a manner similar described in conjunction withFIGS. 8-13. However, in this particular embodiment, the triggeringprocess can be a result of the pressure differential created byrelatively pressurized air in an air-trap rather than based on a risingfloat as described in FIGS. 8-13. These particular embodiments may bebetter understood with reference to FIGS. 14A-15B in combination withthe detailed description of specific embodiments presented herein.

For FIGS. 14A-15B, many, but not all, of the illustrated features of thedescribed inventions share several features with the embodimentsdescribed in FIGS. 1-13, above. For example, referring specifically toFIG. 14A, the exemplary vacuum cleaner 310 illustrated in this Figureshares many common elements with the exemplary vacuum cleaner in FIGS.1A and 1B (e.g., motor cover 12, hose 14, powerhead 16, cage 18, float20, drum 22, inlet plenum 24, etc.). All of these features are describedin detail with reference to FIGS. 1-13 and thus, in the interest ofclarity and brevity, will not be repeated for the description for FIGS.14A-15B.

Moreover, several features described with reference to FIGS. 8-13 areillustrated in one or more of FIGS. 14A-15B, but not specificallylabeled for these embodiments. One of ordinary skill in the art,therefore, would understand that similar features illustrated in FIGS.14A-15B share common features, descriptions, embodiments as thosefeatures illustrated and described with reference to FIGS. 8-13.Although the portions of the disclosure describing FIGS. 14A-15B mainlyfocus on the differences of those elements previously described withreference to FIGS. 8-13, one of ordinary skill in the art wouldrecognize that one or more of the elements described in reference toFIGS. 14A-15B can be similarly embodied, where appropriate, as thoseelements described in reference to FIGS. 8-13.

FIG. 14A illustrates a section view of a third embodiment of anexemplary vacuum cleaner of the present disclosure with several elementsomitted for clarity. FIG. 14B illustrates an enlarged view of the vacuumcleaner of FIG. 14A. The Figures will be described in conjunction withone another.

In addition to many of the components described in FIG. 8 above withreference to vacuum 110, vacuum 310 can further include a cage 318,first conduits 328 a and 328 b, housing pressure taps 330 a and 330 b,and drum 322. Further, vacuum 310 can include a lid (not shown) and anair-trap 452 a.

The air-trap 452 a can be configured in a number of sizes and shapes andin a variety of locations within the drum 322. For example, the air-trapcan be cylindrical in shape with airtight top and side portions with anopen bottom. Other geometric shapes, in the alternative, arecontemplated as well. Air-trap 452 a (and similarly air-trap 452 b asdescribed in greater detail below) can include any air chamber, plenum,compartment, or any other void that is capable or retaining a gas. Theair-trap 452 a can be coupled to a portion of the drum 322, or in thealternative, another portion or portions of the vacuum 310 (such as, forexample, the filter cage or lid (not shown)). In this configuration, theair-trap 452 a can be rigidly mounted or affixed to these portions toprevent it from rising and falling with the amount of liquid stored inthe drum 322.

In an exemplary and non-limiting illustrative embodiment, air-trap 452 acan take the shape of an upside-down container, such as a cup or thelike, with a housing pressure tap 330 a coupled to the top portion ofthe air-trap 452 a. As noted above, air-trap 452 a can be disposed atvarious locations within the drum 322. In one embodiment, the air-trap452 a can be disposed within the vacuum's 310 filter cage 318. In thisembodiment, the air-trap 452 a can be formed as a separate component asthe filter cage, or, in the alterative, as a single monolith piece(e.g., as a single molded component including both of these elements).An embodiment where the air-trap 452 a is disposed within the filtercage 318 is described in conjunction with FIGS. 14A and 14B.Alternatively, the air-trap can be disposed within the vacuum's drum 322at a location outside the filter cage 318. This embodiment—where theair-trap is labeled as element 452 b—is described in conjunction withFIGS. 15A and 15B in greater detail below.

Referring specifically to FIGS. 14A and 14B, as liquid enters the drum322 and it falls to the bottom of the drum, the level of liquid “L” inthe drum will rise. Because the air-trap 452 a is coupled to filter cage318, liquid rising in the drum will rise above the air-trap 452 a (asshown, for example, in FIG. 14A). However, because air-trap 452 a can beridigly mounted and airtight, air will be trapped in air-trap 452 a andthe liquid will be prevented from entering within the air-trap 452 a. Asshown in FIG. 14A, for example, liquid level L at air-trap 452 a is nearthe bottom of air-trap 452 a even when liquid level L within the drum322 is above the top portion of air-trap 452 a. The height differential“H,” as measured between the height of the liquid level “L” within thedrum and the liquid level “L” around the air-trap 452 a, creates aresulting pressure P1 within air-trap 452 a. As the liquid rises withinthe drum 322, the pressure differential between pressure P1 and pressureP2 (as measured within the drum 322) will increase, and will beproportional to the height differential H. This pressure differential iscommonly referred to the “pressure head” or “inches of water” in thecase the liquid in the drum 322 is water.

In order to detect the pressure differential as a result of the risingliquid within the drum 322, housing pressure tap 330 a can be coupled tothe top portion of the air-trap 452 a, and housing pressure tap 330 bcan be coupled to a portion within the drum (above the rising liquid).First conduit 328 a can be coupled to housing pressure tap 330 a andfirst conduit 328 b can be coupled to housing pressure tap 330 b. Under“normal” operating conditions (i.e., when there is little or no liquidin the drum 322), pressure P1 will be approximately equal to pressureP2. However, as the drum 322 accumulates liquid, the liquid level Loutside air-trap 452 a will rise above air-trap 452 a and thus, pressureP1 will exceed pressure P2. The difference in these two pressures willbe proportional to height differential H between the liquid level L ofthe liquid contacting the bottom portion of air-trap 452 a and theliquid level L inside the drum.

This pressure differential will cause a membrane (e.g., the membrane 140shown in conjunction with FIGS. 8-13) to expand, forcing a portion ofthe membrane in an upwardly direction that will result in it contactinga stem insert area (e.g., the stem insert area 212 shown in conjunctionwith FIGS. 8-13) of a reset shaft (e.g., the reset shaft 214 shown inconjunction with FIGS. 8-13). The remainder of the structure andoperation of the vacuum 310 is similar to the structure and operation ofthe vacuum 110 as discussed above with references to FIGS. 8-13 withregard to the operation of the reset shaft 214 trigging the micro switch238 and disabling the current flow to the vacuum's power supply (see,e.g., the description under the heading “Disabling the Power Supply”)and resetting the vacuum 310 (see, e.g., the description under theheading “Resetting the Power Supply”) as described in greater detailabove.

FIG. 15A illustrates a section view of an alternative to the thirdembodiment of an exemplary vacuum cleaner of the present disclosure withseveral elements omitted for clarity. FIG. 15B illustrates an enlargedview of the vacuum cleaner of FIG. 15A. These Figures will be describedin conjunction with one another.

In an alternative embodiment, air-trap 452 b can be disposed outside thefilter cage 318, but inside drum 322. In one example, the air-trap 452 bcan be coupled or secured to a portion of a lid 454. In another example,air-trap 452 b can be coupled or secured to a portion of the drum 322,such as the side of drum 322. In an exemplary and non-limitingillustrative embodiment, air-trap 452 b can be rigidly secured to ensurethat its position within the drum 322 is not affected by the rise and/orfall of the liquid stored within it.

As liquid enters the drum 322 and it falls to the bottom of the drum,the level of liquid “L” in the drum will rise. Because the air-trap 452b is coupled to the lid 454, or in the alternative, another portion orportions of the vacuum 310, liquid rising in the drum will rise abovethe air-trap 452 b (as shown, for example, in FIG. 15A). However,because air-trap 452 b can be rigidly mounted and airtight, air will betrapped in air-trap 452 b and the liquid will be prevented from enteringwithin the air-trap 452 b. As shown in FIG. 15A, for example, liquidlevel L at air-trap 452 b is near the bottom of air-trap 452 b even whenliquid level L within the drum 322 is well above the top portion ofair-trap 452 b.

In order to detect the pressure differential as a result of the risingliquid within the drum 322, housing pressure tap 330 a can be coupled tothe top portion of the air-trap 452 b, and housing pressure tap 330 bcan be coupled to a portion within the drum (above the rising liquid).First conduit 328 a can be coupled to housing pressure tap 330 a andfirst conduit 328 b can be coupled to housing pressure tap 330 b. Under“normal” operating conditions (i.e., when there is little or no liquidin the drum 322), pressure P1 will be approximately equal to pressureP2. However, as the drum 322 accumulates liquid, the liquid level Loutside air-trap 452 b will rise above air-trap 452 b and thus, pressureP1 will exceed the pressure P2. The difference in these two pressureswill be proportional to the height differential H between the liquidlevel L of the liquid contacting the bottom portion of air-trap 452 band the liquid level L inside the drum.

This pressure differential will cause a membrane (e.g., the membrane 140shown in conjunction with FIGS. 8-13) to expand, forcing a portion ofthe membrane in an upwardly direction that will result it contacting astem insert area (e.g. the stem insert area 212 shown in conjunctionwith FIGS. 8-13) of a reset shaft (e.g., the reset shaft 214 shown inconjunction with FIGS. 8-13). The remainder of the structure andoperation of the vacuum 310 is similar to structure and operation of thevacuum 110 as discussed above with references to FIGS. 8-13 with regardto the operation of the reset shaft 214 trigging the micro switch 238and disabling the current flow to the vacuum's power supply (see, e.g.,the description under the heading “Disabling the Power Supply”) andresetting the vacuum 310 (see, e.g., the description under the heading“Resetting the Power Supply”) as described in greater detail above.

FIG. 16 illustrates a flow diagram depicting an exemplary method forinterrupting a power supply to a vacuum cleaner motor in accordance withcertain aspects of the present disclosure. The method 500 can includethe step 502 of providing an inlet plenum and the step 504 of providinga float adapted to change its position. The position of the float can bea function of an amount of liquid stored in the vacuum cleaner. Themethod 500 can further include the step 506 of detecting a pressuredifferential between a first and second portion of the inlet plenum andthe step 508 of interrupting a current supply of an electrical circuitof a power switch.

The step 506 of detecting a pressure differential between a first andsecond portion of the inlet plenum can be based, at least in part, uponthe position of the float. Furthermore, the step 508 of interrupting acurrent supply of an electrical circuit of a power switch can be basedon the detected pressure differential between the first and secondportion of the inlet plenum.

Although not explicitly illustrated in FIG. 16, the method 500 ofinterrupting a power supply to a vacuum cleaner motor can includeadditional steps and/or variations of the steps explicitly illustratedand described herein. In a non-limiting illustrative example, the method500 can further include the processes described above with reference thestructural components described, along with their functionalinteractions with respect to one another, under the heading “Disablingthe Power Supply.” Accordingly, the steps explicitly illustrated anddescribed herein shall not be considering limiting to the inventionsdescribed herein.

FIG. 17 illustrates a flow diagram depicting an exemplary method foractivating a power supply to a vacuum cleaner motor in accordance withcertain aspects of the present disclosure. The method 600 can includethe step 602 of providing a reset shaft, the step 604 of providing anactuator, and the step 606 of decoupling a stop shoulder from theactuator. The step 602 of providing a reset shaft can further include areset shaft wherein at least a portion of the reset shaft is disposed asan external surface of a vacuum cleaner. Further, the step 604 ofproviding an actuator can further include an actuator that is coupled tothe stop shoulder and a power switch comprising an electrical circuit.Moreover, the step 606 of decoupling from the stop shoulder from theactuator is adapted to complete an electrical circuit coupled to thevacuum cleaner motor.

Although not explicitly illustrated in FIG. 17, the method 600 ofactivating a power supply to a vacuum cleaner motor can includeadditional steps and/or variations of the steps explicitly illustratedand described herein. In a non-limiting illustrative example, the method600 can further include the processes described above with reference thestructural components described, along with their functionalinteractions with respect to one another, under the heading “Resettingthe Power Supply.” Accordingly, the steps explicitly illustrated anddescribed herein shall not be considering limiting to the inventionsdescribed herein.

Particular embodiments of the invention may be described below withreference to block diagrams and/or operational illustrations of methods.It will be understood that each block of the block diagrams and/oroperational illustrations, and combinations of blocks in the blockdiagrams and/or operational illustrations, can be implemented by analogand/or digital hardware, and/or computer program instructions. Suchcomputer program instructions may be provided to a processor of ageneral-purpose computer, special purpose computer, ASIC, and/or otherprogrammable data processing system. The executed instructions maycreate structures and functions for implementing the actions specifiedin the block diagrams and/or operational illustrations.

The order of steps can occur in a variety of sequences unless otherwisespecifically limited. The various steps described herein can be combinedwith other steps, interlineated with the stated steps, and/or split intomultiple steps. Similarly, elements have been described functionally andcan be embodied as separate components or can be combined intocomponents having multiple functions. Discussion of singular elementscan include plural elements and vice-versa.

In some alternate implementations, the functions/actions/structuresnoted in the figures may occur out of the order noted in the blockdiagrams and/or operational illustrations. For example, two operationsshown as occurring in succession, in fact, may be executed substantiallyconcurrently or the operations may be executed in the reverse order,depending upon the functionality/acts/structure involved. For example,FIG. 16 illustrates one possible embodiment of a method. Morespecifically, as presently disclosed in FIG. 16, the step 504 ofproviding a float adapted to change its position occurs after the step502 of providing an inlet plenum. Other embodiments can includeperforming step 504 before step 502. In other embodiments, some stepscan be omitted altogether. Therefore, though not explicitly illustratedin the Figures, any and all combinations or sub-combinations of thesteps illustrated in FIG. 16, or additional steps described in theFigures or the detailed description provided herein, can be performed inany order, with or without regard for performing the other recitedsteps.

The inventions have been described in the context of preferred and otherembodiments and not every embodiment of the invention has beendescribed. Obvious modifications and alterations to the describedembodiments are available to those of ordinary skill in the art. Thedisclosed and undisclosed embodiments are not intended to limit orrestrict the scope or applicability of the invention conceived of by theApplicants, but rather, in conformity with the patent laws, Applicantsintend to fully protect all such modifications and improvements thatcome within the scope or range or equivalent of the following claims.

What is claimed is:
 1. A method for interrupting a power supply to avacuum cleaner motor, the method comprising: providing an inlet plenum;providing a filter cage interfaced between the inlet plenum and acollection drum of a vacuum cleaner, the filter cage configured to asupport a filter thereon; providing a float adapted to change itsposition as a function of an amount of liquid stored in the vacuumcleaner; detecting a pressure differential between a first and secondportion of the vacuum cleaner based, at least in part, upon the positionof the float; and interrupting a current supply of an electrical circuitof a power switch coupled to the vacuum cleaner motor based on thedetected pressure differential between the first and second portion ofthe inlet plenum.
 2. The method of claim 1, wherein detecting a pressuredifferential between a first and second portion of the vacuum cleanerincludes detecting the pressure differential using at least two pressuretaps.
 3. The method of claim 1, wherein detecting a pressuredifferential between a first and second portion of the vacuum cleanerincludes detecting a pressure differential between an area inside theinlet plenum and an area outside the inlet plenum.
 4. The method ofclaim 1, wherein detecting a pressure differential between a first andsecond portion of the vacuum cleaner includes detecting the pressuredifferential based on the float contacting at least a portion of theinlet plenum.
 5. The method of claim 1, wherein the vacuum cleanerincludes a switch shoulder and an actuator, and wherein interrupting acurrent supply of an electrical circuit of a power switch coupled to thevacuum cleaner motor includes interrupting the current supply bycontacting the actuator with the switch shoulder.
 6. The method of claim5, wherein the vacuum cleaner further includes a reset shaft, whereinthe reset shaft includes the switch shoulder, wherein interrupting acurrent supply of an electrical circuit of a power switch coupled to thevacuum cleaner motor includes moving the reset shaft in response todetecting the pressure differential such that the switch shouldercontacts the actuator.
 7. The method of claim 6, wherein the vacuumcleaner further includes a membrane, wherein detecting a pressuredifferential between a first and second portion of the vacuum cleanerincludes moving the membrane from a first position to a second positionsuch that the membrane contacts and moves the reset shaft.
 8. The methodof claim 6, wherein moving the reset shaft causes at least a portion ofthe reset shaft to be disposed as an external surface of the vacuumcleaner.
 9. A method for interrupting a power supply to a vacuum cleanermotor, the method comprising: providing an inlet plenum; providing afloat adapted to change its position as a function of an amount ofliquid stored in a vacuum cleaner; detecting a pressure differentialbetween a first and second portion of the vacuum cleaner based, at leastin part, upon the position of the float, wherein detecting a pressuredifferential includes detecting a pressure differential between an areainside the inlet plenum and an area outside the inlet plenum; andinterrupting a current supply of an electrical circuit of a power switchcoupled to the vacuum cleaner motor based on the detected pressuredifferential between the first and second portion of the inlet plenum.10. The method of claim 9, wherein detecting a pressure differentialbetween a first and second portion of the vacuum cleaner furtherincludes detecting the pressure differential using at least two pressuretaps.
 11. The method of claim 9, wherein detecting a pressuredifferential between a first and second portion of the vacuum cleanerincludes detecting the pressure differential based on the floatcontacting at least a portion of the inlet plenum.
 12. The method ofclaim 9, wherein the vacuum cleaner includes a switch shoulder and anactuator, and wherein interrupting a current supply of an electricalcircuit of a power switch coupled to the vacuum cleaner motor includesinterrupting the current supply by contacting the actuator with theswitch shoulder.
 13. The method of claim 12, wherein the vacuum cleanerfurther includes a reset shaft, wherein the reset shaft includes theswitch shoulder, wherein interrupting a current supply of an electricalcircuit of a power switch coupled to the vacuum cleaner motor includesmoving the reset shaft in response to detecting the pressuredifferential such that the switch shoulder contacts the actuator. 14.The method of claim 13, wherein the vacuum cleaner further includes amembrane, wherein detecting a pressure differential between a first andsecond portion of the vacuum cleaner includes moving the membrane from afirst position to a second position such that the membrane contacts andmoves the reset shaft.
 15. The method of claim 13, wherein moving thereset shaft causes at least a portion of the reset shaft to be disposedas an external surface of the vacuum cleaner.
 16. A method forinterrupting a power supply to a vacuum cleaner motor, the methodcomprising: providing an inlet plenum; providing a float adapted tochange its position as a function of an amount of liquid stored in avacuum cleaner; detecting a pressure differential between a first andsecond portion of the vacuum cleaner based, at least in part, upon theposition of the float, wherein detecting a pressure differentialincludes detecting the pressure differential based on the floatcontacting at least a portion of the inlet plenum; and interrupting acurrent supply of an electrical circuit of a power switch coupled to thevacuum cleaner motor based on the detected pressure differential betweenthe first and second portion of the inlet plenum.
 17. The method ofclaim 16, wherein detecting a pressure differential between a first andsecond portion of the vacuum cleaner includes detecting the pressuredifferential using at least two pressure taps.
 18. The method of claim16, wherein detecting a pressure differential between a first and secondportion of the vacuum cleaner includes detecting a pressure differentialbetween an area inside the inlet plenum and an area outside the inletplenum.
 19. The method of claim 16, wherein the vacuum cleaner includesa switch shoulder and an actuator, and wherein interrupting a currentsupply of an electrical circuit of a power switch coupled to the vacuumcleaner motor includes interrupting the current supply by contacting theactuator with the switch shoulder.
 20. The method of claim 19, whereinthe vacuum cleaner further includes a reset shaft, wherein the resetshaft includes the switch shoulder, wherein interrupting a currentsupply of an electrical circuit of a power switch coupled to the vacuumcleaner motor includes moving the reset shaft in response to detectingthe pressure differential such that the switch shoulder contacts theactuator.